Ubuntu 重啓apache2未成功，錯誤如下：
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message。
解決方案爲：
$ sudo vim /etc/apache2/apache2.conf
最後加一句：
ServerName localhost:80
重啓即可成功！